-77.74% is the change from 831 to 185
Calculation steps:
[( 185 - 831 ) ÷ 831] x 100 = -77.74%
Formula
Percentage change = [(185 - 831) / 831] x 100
Subtract the new number by the original number
185 - 831 = -646
-646 ÷ 831 = -0.7773766546329723
-0.7773766546329723 x 100 = -77.74%